adjective Physical Chemistry, (of liquid crystals)
noting a mesomorphic state in which the arrangement of the molecules is in layers or planes.
Compare nematic.

1665–75 for earlier sense “cleansing”; < Latin smēcticus < Greek smēktikós, equivalent to smēkt(ós) smeared, verbid of smḗchein to wash out, clean + -tikos -tic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
smectic (ˈsmɛktɪk)
chem Compare nematic See also liquid crystal (of a substance) existing in or having a mesomorphic state in which the molecules are oriented in layers
[C17: via Latin from Greek smēktikos, from smēkhein to wash; from the soaplike consistency of a smectic substance]

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Example sentences
The system then orders or partially orders to a moving crystal or smectic.
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